2017A&A...598A.134A

Query : 2017A&A...598A.134A

2017A&A...598A.134A - Astronomy and Astrophysics, volume 598A, 134-134 (2017/2-1)

Searching for γ-ray signature in WHSP blazars. Fermi-LAT detection of 150 excess signal in the 0.3-500 GeV band.

ARSIOLI B. and CHANG Y.-L.

Abstract (from CDS):

Aims. A direct search of γ-ray emission centered on multifrequency selected candidates is a valuable complementary approach to the standard search adopted in current γ-ray Fermi-LAT catalogs. Our sources are part of the 2WHSP sample that was assembled with the aim of providing targets for Imaging Atmospheric Cherenkov Telescopes (IACT). A likelihood analysis based on their known position enabled us to detect 150 γ-ray excess signals that have not yet been reported in previous γ-ray catalogs (1FGL, 2FGL, 3FGL). By identifying new sources, we solve a fraction of the extragalactic isotropic γ-ray background (IGRB) composition, improving the description of the γ-ray sky.
Methods. We perform data reduction with the Fermi Science Tools using positions from 400 high synchrotron peaked (HSP) blazars as seeds of tentative γ-ray sources; none of them have counterparts from previous 1FGL, 2FGL and 3FGL catalogs. Our candidates are part of the 2WHSP sample (currently the largest set of HSP blazars). We focus on HSPs characterized by bright synchrotron component with peak flux νf(ν)≥10–12.1erg/cm2/s, testing the hypothesis of having a γ-ray source in correspondence to the WHSP positions. Our likelihood analysis considers the 0.3-500GeV energy band, integrating over 7.2yr of Fermi-LAT observation and making use of the Pass 8 data release.
Results. From the 400 candidates tested, a total of 150 2WHSPs showed excess γ-ray signature: 85 high-significance detections with test statistic (TS)>25, and 65 lower-significance detections with TS between 10 to 25. We assume a power law spectrum in the 0.3-500GeV band and list the spectrum parameters describing all 150 new γ-ray sources. We study the γ-ray photon spectral index distribution, the likelihood of detection according to the synchrotron peak brightness (figure of merit parameter), and plot the measured γ-ray LogN-LogS of HSP blazars, also discussing the portion of the IGRB that has been resolved by the present work. We also report on four cases where we could resolve source confusion and find counterparts for unassociated 3FGL sources with the help of high-energy TS maps together with multifrequency data. The 150 new γ-ray sources are named with the acronym 1BIGB for the first version of the Brazil ICRANet Gamma-ray Blazar catalog, in reference to the cooperation agreement supporting this work.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: active - BL Lacertae objects: general - radiation mechanisms: non-thermal - gamma rays: diffuse background - gamma rays: general

VizieR on-line data: <Available at CDS (J/A+A/598/A134): tablea1.dat tablea2.dat>

Nomenclature: Table A.1: 1BIGB JHHMMSS.s+DDMMSS N=150.

Simbad objects: 156

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Number of rows : 156
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 4FGL J0009.8-4317 BLL 00 09 49.77 -43 16 50.3           ~ 14 0
2 1BIGB J001328.8+094929 Bla 00 13 28.80 +09 49 30.5           ~ 4 0
3 SDSS J001527.94+353639.0 BLL 00 15 27.9464473488 +35 36 39.033974304       18.5   ~ 21 0
4 1BIGB J002928.6+205332 Bla 00 29 28.60 +20 53 33.7           ~ 15 0
5 2MASX J00414706-4701364 BLL 00 41 47.0180375376 -47 01 36.915505968           ~ 15 0
6 SDSS J005816.78+172313.2 BLL 00 58 16.7805708888 +17 23 13.315476408     20.3 18.9   ~ 18 0
7 1BIGB J010250.8-200158 Bla 01 02 51.0 -20 01 58           ~ 21 1
8 2FHL J0114.9-3359 BLL 01 15 01.6479182544 -34 00 27.119000088       19.1   ~ 29 0
9 SDSS J012657.23+330730.2 BLL 01 26 57.2379078072 +33 07 30.315326268     17.70 18.7   ~ 27 0
10 SDSS J014040.89-075849.0 BLL 01 40 40.8911639232 -07 58 48.990888084     19.30 18.5   ~ 30 0
11 QSO B0158+001 BLL 02 01 06.1794930072 +00 34 00.135789564   18.99 18.42 18   ~ 108 0
12 1BIGB J020412.9-333339 BLL 02 04 12.9304093536 -33 33 41.065719768       19   ~ 23 0
13 1BIGB J021205.6-255757 Bla 02 12 05.74 -25 57 58.3           ~ 13 0
14 RX J0212.3-0222 Bla 02 12 16.8834524928 -02 21 55.817658756           ~ 19 0
15 2MASS J02163209+2314504 BLL 02 16 32.0944044336 +23 14 50.353758528       18.4   ~ 30 0
16 2MASS J02204845-0842506 BLL 02 20 48.4684528704 -08 42 50.421209760   18.98 18.43 18.16   ~ 35 0
17 1BIGB J023340.9+065611 Bla 02 33 41.0 +06 56 10           ~ 6 0
18 1BIGB J023430.5+804336 Bla 02 34 30.61 +80 43 37.3           ~ 13 0
19 QSO B0257+34 BLL 03 01 03.7549027896 +34 41 01.078942128     18.53     ~ 63 0
20 2MASS J03033020+0554303 BLL 03 03 30.2006232720 +05 54 30.192130080     17.9 16.3   ~ 32 0
21 2MASS J03043394-0054043 BLL 03 04 33.9589424424 -00 54 04.710232836   19.58 18.96 18.3   ~ 37 0
22 1BIGB J030544.1+403509 Bla 03 05 44.15 +40 35 10.5           ~ 4 0
23 1BIGB J031103.1-440227 Bla 03 11 03.26 -44 02 28.0           ~ 12 0
24 4FGL J0314.3+0620 BLL 03 14 23.9279493480 +06 19 56.525566764   19.8 17.9 17.5   ~ 41 0
25 1BIGB J032009.1-704533 Bla 03 20 09.21 -70 45 33.6           ~ 15 0
26 1BIGB J032037.9+112451 Bla 03 20 38.03 +11 24 52.3           ~ 4 0
27 1BIGB J032056.2+042447 Bla 03 20 56.38 +04 24 48.4           ~ 4 0
28 1BIGB J032647.2-340446 Bla 03 26 47.35 -34 04 47.8           ~ 12 0
29 1BIGB J032852.6-571605 Bla 03 28 52.69 -57 16 05.5           ~ 12 0
30 4FGL J0336.5-0348 BLL 03 36 23.8026141624 -03 47 38.594258592   18.53 17.40 16.91   ~ 30 0
31 1BIGB J033831.9-570447 BLL 03 38 31.9 -57 04 52           ~ 19 0
32 4FGL J0359.0-3053 BLL 03 58 56.1047599056 -30 54 47.886192072   17.7 18.10 17.6   ~ 25 0
33 1BIGB J041112.2-394143 BLL 04 11 12.3746456904 -39 41 43.635220980       19.5   ~ 17 0
34 1BIGB J041238.3-392629 Bla 04 12 38.45 -39 26 29.5           ~ 4 0
35 QSO B0419+19 BLL 04 22 18.6125654952 +19 50 46.908625740       18.6   ~ 84 0
36 1BIGB J042900.1-323641 BLL 04 29 00.1791493200 -32 36 41.096135520     19.00 18.3   ~ 21 0
37 1BIGB J043517.7-262121 Bla 04 35 17.76 -26 21 22.3           ~ 17 0
38 4FGL J0441.5+1505 BLL 04 41 27.4667781960 +15 04 55.600800780       18.4   ~ 26 0
39 2MASS J04424066+6140394 Bla 04 42 40.6481398176 +61 40 39.421467192           ~ 21 1
40 1BIGB J044328.3-415156 BLL 04 43 28.3 -41 51 58           ~ 15 0
41 4FGL J0503.5-1116 BLL 05 03 35.4199786056 -11 15 06.738530040       19.9   ~ 24 0
42 1BIGB J050419.5-095631 Bla 05 04 19.51 -09 56 32.8           ~ 4 0
43 LEDA 609990 Bla 05 06 01.6713583416 -38 20 55.665751596   17.87   16.36   ~ 15 0
44 1BIGB J050727.1-334635 Bla 05 07 27.1 -33 46 36           ~ 17 0
45 1BIGB J053626.8-254748 Bla 05 36 26.89 -25 47 48.2           ~ 12 0
46 2FGL J0536.2-3348 BLL 05 36 29.0674147920 -33 43 02.465333796 17.11 16.97 16.93 16.8   ~ 53 0
47 1BIGB J053645.2-255841 Bla 05 36 45.34 -25 58 41.5           ~ 4 0
48 1BIGB J055716.7-061706 Bla 05 57 16.83 -06 17 06.7           ~ 14 0
49 2MASS J06071437-2518593 BLL 06 07 14.3762931000 -25 18 59.352566472       17.7   ~ 25 0
50 1BIGB J062149.6-341148 BLL 06 21 49.7056934664 -34 11 49.346560176       20.2   ~ 24 0
51 1BIGB J062626.2-171045 Bla 06 26 26.28 -17 10 46.6           ~ 10 0
52 1BIGB J063014.9-201236 Bla 06 30 15.06 -20 12 36.4           ~ 4 0
53 1BIGB J065932.8-674350 Bla 06 59 32.92 -67 43 50.1           ~ 14 0
54 1BIGB J071745.0-552021 Bla 07 17 45.06 -55 20 22.0           ~ 14 0
55 ICRF J073152.7+280432 Sy2 07 31 52.7289827136 +28 04 32.936159892     17.60 16.2   ~ 37 1
56 7C 073012.09+352219.00 BLL 07 33 29.5804182336 +35 15 42.720710040     17.90 16.4   ~ 24 1
57 FIRST J075936.1+132117 Bla 07 59 36.1360145184 +13 21 17.841223152           ~ 17 0
58 1BIGB J080015.4+561107 Bla 08 00 15.547 +56 11 07.30           ~ 14 0
59 1BIGB J080135.8+463824 Bla 08 01 36.034 +46 38 24.62           ~ 4 0
60 ICRF J082904.8+175415 Sy2 08 29 04.8275335680 +17 54 15.865834356     13.90     ~ 53 1
61 SDSS J083724.71+145819.8 BLL 08 37 24.7133427936 +14 58 19.762029480       14.7   ~ 33 1
62 3HSP J085749.1+013530 BLL 08 57 49.8048492216 +01 35 30.318573336   18.76 18.12 15.7   ~ 37 1
63 2MASX J09080217-0959378 BLL 09 08 02.2023627168 -09 59 37.432877532   15.0   14.40   ~ 44 0
64 [VV96] J090953.3+310603 BLL 09 09 53.2839851256 +31 06 03.167783208   18.74 17.98     ~ 55 0
65 4FGL J0913.3+8133 BLL 09 13 22.5606393408 +81 33 02.952282564   20.70   19.3   ~ 25 0
66 6C 091313+525115 BLL 09 16 51.9350409624 +52 38 28.331223072   19.02 18.10 15   ~ 73 1
67 2MASS J09323935+1042352 BLL 09 32 39.3632208192 +10 42 35.178509520   19.41 18.63 17.6   ~ 26 0
68 1RXS J093430.2-172117 BLL 09 34 30.1620445536 -17 21 21.470293944   20.32 18.10 18.95   ~ 32 0
69 4FGL J0935.3-1736 BLL 09 35 14.6 -17 37 16           ~ 22 0
70 LEDA 2765951 BLL 09 52 24.2117512536 +75 02 13.168604688     19.90 15.6   ~ 32 0
71 SDSS J095507.88+355100.8 BLL 09 55 07.8818398488 +35 51 00.885435048   21.04 20.36 19.1   ~ 53 0
72 LEDA 984246 Bla 09 56 28.2142037784 -09 57 19.191491424   17       ~ 21 0
73 1BIGB J095849.8+703959 Bla 09 58 50.7 +70 39 57           ~ 15 1
74 4FGL J1021.1+1626 BLL 10 21 00.3533388672 +16 25 54.017072220       18.4   ~ 19 0
75 QSO B1040+0110 Bla 10 43 03.8426985192 +00 54 20.420781192   19.3 19.18     ~ 37 0
76 4FGL J1049.7+5011 BLL 10 48 57.6133743624 +50 09 45.261947376   20.78 19.84 18.5   ~ 24 0
77 4FGL J1055.5-0125 BLL 10 55 34.3694040000 -01 26 16.303689636   18.86 18.54 18.8   ~ 33 0
78 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2671 1
79 SDSS J111717.53+000633.6 BLL 11 17 17.5367065392 +00 06 33.637657068   20.00 19.38 19.2   ~ 21 0
80 2MASS J11231805-3232181 Bla 11 23 18.0683979288 -32 32 18.471443784           ~ 14 0
81 1BIGB J112611.8-203723 Bla 11 26 11.94 -20 37 24.0           ~ 5 0
82 1BIGB J113046.0-313807 Bla 11 30 46.1356290456 -31 38 07.564644924   18.42   16.84   ~ 21 0
83 1BIGB J113105.2-094405 Bla 11 31 05.27 -09 44 06.4           ~ 18 0
84 1BIGB J113444.6-172900 BLL 11 34 44.6993489376 -17 29 01.733715888       19.2   ~ 24 0
85 2MASS J11375560-1710421 BLL 11 37 55.6036520688 -17 10 42.048213312   19.0   18.8   ~ 31 0
86 2MASS J12115866+2242329 BLL 12 11 58.6306591752 +22 42 32.946579432   19.13 18.66 18.7   ~ 26 1
87 ICRF J121510.9+073204 Sy2 12 15 10.9765816512 +07 32 04.676330688     16.0 14.8   ~ 103 1
88 4FGL J1216.1-0242 BLL 12 16 03.2612664000 -02 43 04.698161688   17.73 17.26 17.45   ~ 25 0
89 4FGL J1241.5+3439 BLL 12 41 41.3827131720 +34 40 31.005349824   20.21 19.70 19.4   ~ 32 0
90 2WHSP J125015.4+315559 BLL 12 50 15.5272824960 +31 55 59.590861716   19.31 18.95 19.7   ~ 16 0
91 4FGL J1253.5-3934 BLL 12 53 41.2576033944 -39 31 59.450276892   18.73   17.18   ~ 30 1
92 2MASS J12584805-0447450 BLL 12 58 48.0460059168 -04 47 45.263736096     20.40 18.9   ~ 30 0
93 4FGL J1301.6+4056 BLL 13 01 45.6483002736 +40 56 24.643449456   18.1 18.21 18.3   ~ 39 1
94 1BIGB J130713.3-034430 Bla 13 07 13.38 -03 44 31.0           ~ 4 0
95 4FGL J1325.6-0227 BLL 13 25 41.9201565624 -02 28 10.112982312   20.47 20.00 19.6   ~ 24 0
96 4FGL J1326.1+1232 BLL 13 26 17.7036437760 +12 29 58.736692644   19.51 18.63 16.6   ~ 34 1
97 SDSS J132833.56+114520.5 BLL 13 28 33.5701523640 +11 45 20.523468276   19.71 19.20 19.4   ~ 21 0
98 SDSS J133612.16+231958.0 BLL 13 36 12.1589772816 +23 19 58.041745932   18.4   18.2   ~ 27 0
99 2MASS J13532805+5600566 BLL 13 53 28.0474623240 +56 00 56.986350984   19.31 18.92 16.4   ~ 37 0
100 4FGL J1406.6-3934 BLL 14 06 30.0654065496 -39 35 09.209934852       19.7   ~ 24 0
101 1BIGB J143342.7-730437 Bla 14 33 42.7990720728 -73 04 37.499573748           ~ 8 0
102 1BIGB J143825.4+120418 BLL 14 38 25.6 +12 04 19   19.3   17.8   ~ 22 0
103 ATPMN J144236.3-462301 Bla 14 42 36.3752500224 -46 23 01.796065116   18.37   16.63   ~ 18 0
104 LEDA 1588808 Bla 14 55 08.2245134472 +19 20 15.391495428   18.9       ~ 9 0
105 1BIGB J145543.6-760051 Bla 14 55 43.69 -76 00 52.2           ~ 14 0
106 4FGL J1456.0+5051 BLL 14 56 03.6389208720 +50 48 25.975448676   19.84 19.51 18.1   ~ 38 0
107 1BIGB J150637.0-054004 BLL 15 06 37.1078795520 -05 40 04.824178464     20.0 19.1   ~ 22 0
108 2XMM J151041.0+333505 BLL 15 10 41.1182766024 +33 35 04.705463004   18.6 17.70 15.1   ~ 38 0
109 1BIGB J151136.8-165326 Bla 15 11 36.90 -16 53 26.8           ~ 4 0
110 2MASS J15161873-1523439 BLL 15 16 18.7342833936 -15 23 44.076511464     19.6 18.5   ~ 21 0
111 SDSS J151826.68+075222.3 Bla 15 18 26.6879544120 +07 52 22.355054220           ~ 15 0
112 LEDA 97478 Bla 15 18 45.7276771080 +06 13 56.112249504   16.65   15.37   ~ 56 2
113 1BIGB J152646.6-153025 Bla 15 26 46.4 -15 30 42           ~ 15 0
114 [VV2006] J152913.6+381217 BLL 15 29 13.5612494904 +38 12 17.489639232   19.05 18.77     ~ 31 0
115 1BIGB J154202.9-291509 Bla 15 42 03.0838729272 -29 15 08.999709228           ~ 18 0
116 1BIGB J154625.0-285723 Bla 15 46 25.00 -28 57 23.8           ~ 4 0
117 1BIGB J155053.2-082245 Bla 15 50 53.28 -08 22 46.8           ~ 16 0
118 1BIGB J155432.5-121324 Bla 15 54 32.58 -12 13 25.1           ~ 13 0
119 4FGL J1602.2+3051 BLL 16 02 18.0690481440 +30 51 09.537519708   18.56 18.10     ~ 44 1
120 SDSS J160519.04+542059.9 BLL 16 05 19.0570123248 +54 20 59.952793272 19.39 19.80 19.08 18.9   ~ 44 0
121 87GB 160401.0+135348 BLL 16 06 18.3886360920 +13 45 32.825507328           ~ 19 1
122 1BIGB J161327.1-190835 Bla 16 13 27.17 -19 08 36.3           ~ 13 0
123 2WHSP J162115.1-003140 BLL 16 21 15.2141650272 -00 31 40.392663276   19.78 19.18 19.4   ~ 15 0
124 1BIGB J162330.4+085724 Bla 16 23 30.56 +08 57 24.3           ~ 15 0
125 3FHL J1626.4+6257 BLL 16 26 46.0616040480 +63 00 48.406573944   19.4       ~ 12 0
126 2MASS J16422033+2211435 BLL 16 42 20.3168665176 +22 11 43.397477484   19.37 18.86     ~ 27 0
127 6C 164251+455211 BLL 16 44 19.9733510880 +45 46 44.350987764   19.44 18.50 15.2   ~ 64 1
128 1BIGB J165517.8-224045 Bla 16 55 17.95 -22 40 45.5           ~ 7 1
129 1BIGB J171108.5+024403 Bla 17 11 08.69 +02 44 04.8           ~ 4 0
130 1BIGB J174419.7+185218 Bla 17 44 19.80 +18 52 18.0           ~ 12 0
131 RX J1747.0+4938 BLL 17 47 02.4777986448 +49 38 01.630465440       19.3   ~ 25 0
132 3FGL J1838.5-6006 BLL 18 38 06.9 -60 00 34           ~ 25 0
133 4FGL J1848.5+6537 BLL 18 48 22.4966893920 +65 36 57.823557264       18.6   ~ 27 0
134 1BIGB J185023.9+263153 Bla 18 50 24.03 +26 31 53.6           ~ 12 0
135 4FGL J1858.3+4321 BLL 18 58 13.4396542320 +43 24 52.205966964           ~ 18 1
136 1BIGB J193412.7-241919 Bla 19 34 12.77 -24 19 20.4           ~ 17 0
137 2MASS J19435624+2118233 Bla 19 43 56.244 +21 18 23.38           ~ 89 3
138 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 625 2
139 ASASSN -15ha Bla 20 02 04.041 -57 36 44.70           ~ 18 0
140 1BIGB J201200.9-771219 Bla 20 12 00.98 -77 12 19.9           ~ 4 0
141 SDSS J205242.61+081040.6 BLL 20 52 42.6125135040 +08 10 40.625854752       18.9   ~ 22 0
142 ICRF J214533.3-043439 BLL 21 45 33.3884339088 -04 34 39.180363636   16.22 16.20 14.89   ~ 26 0
143 4FGL J2152.0-1205 BLL 21 52 14.1160934856 -12 05 41.497924704     18.90 18.6   ~ 24 0
144 1BIGB J220107.3-590639 Bla 22 01 07.33 -59 06 40.6           ~ 4 0
145 9Y-MST J2201-1706 BLL 22 01 55.8314504520 -17 07 00.517947276   18.42 16.70 16.89   ~ 17 0
146 1BIGB J221029.5+362159 Bla 22 10 29.68 +36 21 59.8           ~ 4 0
147 2MASS J22110831-0003023 BLL 22 11 08.3443664328 -00 03 02.503763640   19.63 19.00 17.3   ~ 38 0
148 2MASS J22330112+1336022 BLL 22 33 01.1160978528 +13 36 01.994608836   19.66 18.88 17.6   ~ 35 0
149 1BIGB J223626.2+370713 BLL 22 36 26.3408589408 +37 07 13.494663588           ~ 20 1
150 4FGL J2249.4-1300 BLL 22 49 10.7315054688 -13 00 03.068180892     18.60 18.2   ~ 34 0
151 1BIGB J225147.5-320611 BLL 22 51 47.5594856352 -32 06 12.723850044     20.00 18.7   ~ 42 0
152 2MASS J22561332-3303386 BLL 22 56 13.3204162224 -33 03 38.527749144     17.20     ~ 20 0
153 1BIGB J230634.9-110347 BLL 23 06 34.9995759288 -11 03 48.248438076     19.30 20   ~ 20 0
154 1BIGB J232039.7-630918 Bla 23 20 39.85 -63 09 18.1           ~ 10 0
155 1BIGB J233112.8-030129 Bla 23 31 12.97 -03 01 30.4           ~ 12 0
156 1BIGB J235320.9-145856 BLL 23 53 21.1238293008 -14 58 57.523564092     19.70 19.5   ~ 20 0

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